Camshaft timing control, checking Page 1 of 7
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Camshaft timing control,
checking
The adjustment of the intake camshaft is
dependent on the engine load and engine speed.
Oil pressure is applied to the camshaft adjuster
(mechanical adjustment device) via the electrical
solenoid valve for camshaft adjustment.
Note:
Camshaft timing control only becomes active 25
seconds after starting engine.
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Camshaft adjustment solenoid valves,
checking
Special tools and equipment
VAG 1526 A
VAG 1527 B
VAG 1594 A
VAG 1598/31
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Test requirements:
Vehicle diagnostic, testing and information
system VAS 5051 or VAG 1551 Scan Tool
connected
Test sequence
- Initiate output Diagnostic Test Mode (DTM) and
activate solenoid valve for camshaft adjuster.
Display
Output Diagnostic Test Mode
Camshaft timing control
This valve is actuated (clicks) for approx. one minute if the operation is
not switched to the next component by pressing the key.
If the valve is not actuated (does not click).
- Check internal resistance of solenoid valve for camshaft adjuster.
Checking internal resistance
- Switch ignition off.
- Disconnect connector -arrow- from camshaft adjuster.
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- Connect multimeter to valve to measure resistance.
Specified value: 10 to 18
If specified value is not attained:
- Replace solenoid valve for camshaft adjuster.
If specified value is attained:
- Check power supply.
Checking power supply
Test requirements:
Fuse for solenoid valve for camshaft adjustment OK
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
Fuel pump relay OK.
Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel Injection & Ignition,
Engine Code(s): AWM, Repair Group 24
- Disconnect connector -arrow- from camshaft adjuster.
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- Connect voltage tester VAG 1527 B as follows:
Connector Measure to
contact
1 Engine Ground
- Operate starter briefly.
LED should light up.
If the LED does not light up:
- Check wiring from contact 1 on connector via fuse to fuel pump relay
for open circuit:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
- Correct open circuit, if necessary.
If the LED lights up:
- Check actuation.
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Checking actuation
- Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of
connector.
- Initiate output Diagnostic Test Mode (DTM) and activate solenoid valve
for camshaft adjuster.
Display
Output Diagnostic Test Mode
Camshaft timing control
LED should flash.
If the LED lamp does not flash or if it lights up continuously:
- Connect the VAG 1598/31 test box to wiring harness leading to engine
control module (the engine control module should not be connected):
Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel Injection & Ignition,
Engine Code(s): AWM, Repair Group 24
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- Check for open circuit and short to positive or Ground in following
wiring connection:
Connector Test box VAG 1598/31
Contact
2 115
- If necessary, correct short circuit to Ground or open circuit.
If the wiring is OK:
- Replace engine control module.
If no fault is found:
- Replace mechanical camshaft adjuster.
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